Imaging optical lens assembly, image capturing unit and electronic device

ABSTRACT

An imaging optical lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element has negative refractive power. The second lens element has negative refractive power. The third lens element has negative refractive power. The imaging optical lens assembly has a total of six lens elements.

RELATED APPLICATIONS

This application is a continuation patent application of U.S.application Ser. No. 15/186,362, filed Jun. 17, 2016, which claimspriority to Taiwan Application 105112345, filed Apr. 20, 2016, which isincorporated by reference herein in its entirety.

BACKGROUND Technical Field

The present disclosure relates to an imaging optical lens assembly, animage capturing unit and an electronic device, more particularly to animaging optical lens assembly and an image capturing unit applicable toan electronic device.

Description of Related Art

In recent years, with the popularity of electronic devices having camerafunctionalities, the demand of miniaturized optical systems has beenincreasing. As the advanced semiconductor manufacturing technologieshave reduced the pixel size of sensors, and compact optical systems havegradually evolved toward the field of higher megapixels, there is anincreasing demand for compact optical systems featuring better imagequality.

The optical systems have been widely applied to different kinds ofelectronic devices, such as smart phones, wearable devices, tabletpersonal computers, dashboard cameras, surveillance devices, sportcameras and aerial photographic cameras, for various requirements.However, the conventional compact optical system is unable to satisfythe requirements of wide field of view, compact size, low sensitivity toenvironment and high image resolution simultaneously. Thus, there is aneed to develop an optical system featuring a wide viewing angle,compact size, minimized environmental effects and high image quality.

SUMMARY

According to one aspect of the present disclosure, an imaging opticallens assembly includes, in order from an object side to an image side, afirst lens element, a second lens element, a third lens element, afourth lens element, a fifth lens element and a sixth lens element. Thefirst lens element has negative refractive power. The second lenselement has negative refractive power. The third lens element hasnegative refractive power. The imaging optical lens assembly has a totalof six lens elements. When, a central thickness of the fifth lenselement is CT5, a central thickness of the sixth lens element is CT6, afocal length of the imaging optical lens assembly is f, a curvatureradius of an object-side surface of the third lens element is R5, acurvature radius of an image-side surface of the third lens element isR6, an axial distance between the first lens element and the second lenselement is T12, the following conditions are satisfied:−4.50<(R5+R6)/(R5−R6)<2.80;0<CT6/CT5<3.60; and0.80<T12/f<2.0.

According to another aspect of the present disclosure, an imagingoptical lens assembly includes, in order from an object side to an imageside, a first lens element, a second lens element, a third lens element,a fourth lens element, a fifth lens element and a sixth lens element.The first lens element has negative refractive power. The second lenselement has negative refractive power. The third lens element withnegative refractive power has an object-side surface being concave in aparaxial region thereof. The sixth lens element has an image-sidesurface being convex in a paraxial region thereof. The imaging opticallens assembly has a total of six lens elements, and a curvature radiusof an image-side surface of the fifth lens element has the same sign asa curvature radius of an object-side surface of the sixth lens element.When a thickness of the fifth lens element is CT5, a thickness of thesixth lens element is CT6, a maximum image height of the imaging opticallens assembly is ImgH, a curvature radius of the object-side surface ofthe third lens element is R5, a curvature radius of an image-sidesurface of the third lens element is R6, an axial distance between anobject-side surface of the first lens element and the image-side surfaceof the sixth lens element is Td, the following conditions are satisfied:−3.50<(R5+R6)/(R5−R6)<0;0<CT6/CT5<3.60; and1.0<Td/ImgH<12.5.

According to another aspect of the present disclosure, an imagecapturing unit includes the aforementioned imaging optical lens assemblyand an image sensor, wherein the image sensor is disposed on an imagesurface of the imaging optical lens assembly.

According to still another aspect of the present disclosure, anelectronic device includes the aforementioned image capturing unit.

According to still yet another aspect of the present disclosure, animaging optical lens assembly includes, in order from an object side toan image side, a first lens element, a second lens element, a third lenselement, a fourth lens element, a fifth lens element and a sixth lenselement. The first lens element has negative refractive power. Thesecond lens element has negative refractive power. The third lenselement with negative refractive power has an object-side surface beingconcave in a paraxial region thereof. The fourth lens element haspositive refractive power. The sixth lens element has an image-sidesurface being convex in a paraxial region thereof. The imaging opticallens assembly has a total of six lens elements. When a central thicknessof the fifth lens element is CT5, a central thickness of the sixth lenselement is CT6, a focal length of the imaging optical lens assembly isf, a focal length of the first lens element is f1, a focal length of thesecond lens element is f2, a focal length of the third lens element isf3, a focal length of the fourth lens element is f4, a focal length ofthe fifth lens element is f5, a focal length of the sixth lens elementis f6, a focal length of the i-th lens element is fi, a sum of absolutevalues of ratios f/fi is Σ|f/fi|, a curvature radius of the object-sidesurface of the third lens element is R5, a curvature radius of animage-side surface of the third lens element is R6, the followingconditions are satisfied:−4.0<(R5+R6)/(R5−R6)<0.65;0<CT6/CT5<3.60; and2.0<Σ|f/fi|<5.0, wherein i=1,2,3,4,5,6.

According to still yet another aspect of the present disclosure, animage capturing unit includes the aforementioned imaging optical lensassembly and an image sensor, wherein the image sensor is disposed on animage surface of the imaging optical lens assembly.

According to still yet another aspect of the present disclosure, anelectronic device includes the aforementioned image capturing unit.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure can be better understood by reading the followingdetailed description of the embodiments, with reference made to theaccompanying drawings as follows:

FIG. 1 is a schematic view of an image capturing unit according to the1st embodiment of the present disclosure;

FIG. 2 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 1stembodiment;

FIG. 3 is a schematic view of an image capturing unit according to the2nd embodiment of the present disclosure;

FIG. 4 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 2ndembodiment;

FIG. 5 is a schematic view of an image capturing unit according to the3rd embodiment of the present disclosure;

FIG. 6 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 3rdembodiment;

FIG. 7 is a schematic view of an image capturing unit according to the4th embodiment of the present disclosure;

FIG. 8 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 4thembodiment;

FIG. 9 is a schematic view of an image capturing unit according to the5th embodiment of the present disclosure;

FIG. 10 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 5thembodiment;

FIG. 11 is a schematic view of an image capturing unit according to the6th embodiment of the present disclosure;

FIG. 12 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 6thembodiment;

FIG. 13 is a schematic view of an image capturing unit according to the7th embodiment of the present disclosure;

FIG. 14 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 7thembodiment;

FIG. 15 is a schematic view of an image capturing unit according to the8th embodiment of the present disclosure;

FIG. 16 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 8thembodiment;

FIG. 17 is a schematic view of an image capturing unit according to the9th embodiment of the present disclosure;

FIG. 18 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 9thembodiment;

FIG. 19 is a schematic view of an image capturing unit according to the10th embodiment of the present disclosure;

FIG. 20 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 10thembodiment;

FIG. 21 shows a schematic view of the parameters Y11 and Y62 accordingto the 1st embodiment of the present disclosure;

FIG. 22 shows an electronic device according to one embodiment;

FIG. 23 shows an electronic device according to another embodiment; and

FIG. 24 shows an electronic device according to still anotherembodiment.

DETAILED DESCRIPTION

An imaging optical lens assembly includes, in order from an object sideto an image side, a first lens element, a second lens element, a thirdlens element, a fourth lens element, a fifth lens element and a sixthlens element. The imaging optical lens assembly has a total of six lenselements.

Each of the first lens element and the second lens element has negativerefractive power. Therefore, it is favorable for providing the imagingoptical lens assembly with a retro-focus configuration for projectinglight from a large field of view in the imaging optical lens assembly.

The third lens element has negative refractive power. Furthermore, thethird lens element can have an object-side surface being concave in aparaxial region thereof. Therefore, it is favorable for balancing thenegative refractive power distribution among the first and the secondlens elements so as to reduce astigmatism and improve the image quality.In addition, at least one of an object-side surface of the second lenselement, an image-side surface of the second lens element, theobject-side surface of the third lens element and an image-side surfaceof the third lens element can have at least one inflection point so thatit is favorable for correcting aberrations at the off-axial regiongenerated by the large field of view.

The fourth lens element can have positive refractive power. Therefore,it is favorable for balancing with the negative refractive powerdistribution among the first, second and third lens elements so as toreduce a total track length of the imaging optical lens assembly.

The fifth lens element can have an object-side surface being convex in aparaxial region thereof. Therefore, it is favorable for arranging lenscurvature so as to improve the image quality.

The sixth lens element can have an image-side surface being convex in aparaxial region thereof. Therefore, it is favorable for reducing a backfocal length of the imaging optical lens assembly so as to correct thePetzval sum thereof, thereby improving the flatness of the imagesurface.

According to the imaging optical lens assembly of the presentdisclosure, a curvature radius of an image-side surface of the fifthlens element has the same sign as a curvature radius of an object-sidesurface of the sixth lens element. In detail, the curvature radius ofthe image-side surface of the fifth lens element and the curvatureradius of the object-side surface of the sixth lens element can both bepositive or negative. Therefore, it is favorable for arranging thesurface shapes of the fifth and the sixth lens elements adjacent to eachother, thereby reducing the sensitivity of the imaging optical lensassembly.

According to the imaging optical lens assembly of the presentdisclosure, one of the fifth lens element and the sixth lens element canhave positive refractive power, and the other one of the fifth lenselement and the sixth lens element can have negative refractive power.In detail, the refractive power of the fifth lens element and that ofthe sixth lens element can have different signs. Therefore, it isfavorable for balancing the refractive power distribution at the imageside of the imaging optical lens assembly so as to correct chromaticaberration.

According to the imaging optical lens assembly of the presentdisclosure, the image-side surface of the fifth lens element and theobject-side surface of the sixth lens element can be cemented together,and each of the image-side surface of the fifth lens element and theobject-side surface of the sixth lens element can be aspheric. That is,the fifth lens element and the sixth lens element can be connected as acemented lens element, and the cementing surfaces of the fifth lenselement and the sixth lens element can be aspheric. Therefore, it isfavorable for reducing the temperature effect and providing higherflexibility in lens shape designs, thereby reducing aberrations at theoff-axial region.

When a curvature radius of the object-side surface of the third lenselement is R5, a curvature radius of the image-side surface of the thirdlens element is R6, the following condition is satisfied:−4.50<(R5+R6)/(R5−R6)<2.80. Therefore, it is favorable for arranging thesurface shapes of the third lens element without being overly curved soas to increase the manufacturing yield rate. In addition, it isfavorable for correcting distortion with a large field of view.Preferably, the following condition can also be satisfied:−4.0<(R5+R6)/(R5−R6)<0.65. More preferably, the following condition canalso be satisfied: −3.50<(R5+R6)/(R5−R6)<0.

When a thickness of the fifth lens element is CT5, a thickness of thesixth lens element is CT6, the following condition is satisfied:0<CT6/CT5<3.60. Therefore, it is favorable for configuring the thicknessof each lens element at the image side so as to improve the imagequality. Preferably, the following condition can also be satisfied:0<CT6/CT5<3.25.

When a focal length of the imaging optical lens assembly is f, an axialdistance between the first lens element and the second lens element isT12, the following condition can be satisfied: 0.80<T12/f<2.0.Therefore, it is favorable for obtaining wide angle and compactnesscharacteristics so as to correct axial chromatic aberration whilereducing the axial distance between the first lens element and thesecond lens element. Thus, it is favorable for lens assembling andminiaturization. Preferably, the following condition can also besatisfied: 1.55<T12/f<2.0.

When a maximum image height of the imaging optical lens assembly (halfof a diagonal length of an effective photosensitive area of an imagesensor) is ImgH, an axial distance between an object-side surface of thefirst lens element and the image-side surface of the sixth lens elementis Td, the following condition can be satisfied: 1.0<Td/ImgH<12.5.Therefore, it is favorable for arranging the ratio of the total tracklength to the image height so that the imaging optical lens assembly canbe utilized for more applications. Preferably, the following conditioncan also be satisfied: 4.0<Td/ImgH<8.5.

When the focal length of the imaging optical lens assembly is f, a focallength of the first lens element is f1, a focal length of the secondlens element is f2, a focal length of the third lens element is f3, afocal length of the fourth lens element is f4, a focal length of thefifth lens element is f5, a focal length of the sixth lens element isf6, that is, the focal length of the i-th lens element is fi, a sum ofabsolute values of ratios f/fi is Σ|f/fi|, the following condition canbe satisfied: 2.0<Σ|f/fi|<5.0, wherein i=1, 2, 3, 4, 5, 6 (which meansthat the condition, 2.0<|f/f1|+|f/f2|+|f/f3|+|f/f4|+|f/f5|+|f/f6|<5.0,can be satisfied). Therefore, it is favorable for arranging the sum ofthe refractive power of the lens elements so as to balance therefractive power of each lens element while maintaining the wide anglecharacteristic.

When a curvature radius of an object-side surface of the fourth lenselement is R7, and a curvature radius of an image-side surface of thefourth lens element is R8, the following condition can be satisfied:|R7/R8|<1.10. Therefore, it is favorable for arranging the surfaceshapes of the fourth lens element so as to correct aberrations generatedby the first through the third lens elements.

When a curvature radius of the object-side surface of the sixth lenselement is R11, a curvature radius of the image-side surface of thesixth lens element is R12, the following condition can be satisfied:−1.80<(R11−R12)/(R11+R12)<2.0. Therefore, it is favorable for arrangingthe surface shapes of the sixth lens element so as to correctaberrations.

When a curvature radius of the object-side surface of the fifth lenselement is R9, the curvature radius of the image-side surface of thesixth lens element is R12, the following condition can be satisfied:−1.0<(R9+R12)/(R9−R12)<1.0. Therefore, it is favorable for arrangingcurvatures of the lens elements at the image side so as to reduce theback focal length of the imaging optical lens assembly. Preferably, thefollowing condition can also be satisfied: −0.20<(R9+R12)/(R9−R12)<0.20.

When half of a maximal field of view of the imaging optical lensassembly is HFOV, the following condition can be satisfied:|1/tan(HFOV)|<0.50. Therefore, it is favorable for enlarging the fieldof view so that the imaging optical lens assembly can be utilized formore applications.

When the focal length of the first lens element is f1, the focal lengthof the third lens element is f3, the following condition can besatisfied: 1.25<f1/f3<5.0. Therefore, it is favorable for distributingthe refractive power between the first lens element and the third lenselement so as to reduce the sensitivity of the imaging optical lensassembly at the object side and correct the aberrations with the largefield of view.

When the focal length of the imaging optical lens assembly is f, anaxial distance between the object-side surface of the first lens elementand an image surface is TL, the following condition can be satisfied:5.0<TL/f<12.0. Therefore, it is favorable for providing sufficient viewangle for wider field of view and reducing the total track length of theimaging optical lens assembly.

When an entrance pupil diameter of the imaging optical lens assembly isEPD, the curvature radius of the object-side surface of the sixth lenselement is R11, the following condition can be satisfied:|R11/EPD|<1.50. Therefore, it is favorable for arranging the curvatureof the object-side surface of the sixth lens element so as to obtainwide angle and large aperture characteristics.

When a maximum effective radius of the object-side surface of the firstlens element is Y11, a maximum effective radius of the image-sidesurface of the sixth lens element is Y62, the following condition can besatisfied: |Y62/Y11|<0.48. Therefore, it is favorable for providing aretro-focus configuration for the light at large field of view totransmit into the imaging optical lens assembly. As seen in FIG. 21,FIG. 21 shows a schematic view of the parameters Y11 and Y62 accordingto the 1st embodiment of the present disclosure.

When a central thickness of the second lens element is CT2, an axialdistance between the second lens element and the third lens element isT23, the following condition can be satisfied: 0<T23/CT2≤1.78.Therefore, it is favorable for arranging the central thickness of thesecond lens element and the axial distance between the second lenselement and the third lens element, thereby improving the lensassembling process and the manufacturing yield rate.

According to the present disclosure, the lens elements of the imagingoptical lens assembly can be made of glass or plastic material. Indetail, in the present disclosure, at least half of the lens elements ofthe imaging optical lens assembly can be made of plastic material. Thatis, at least three of the first lens element, the second lens element,the third lens element, the fourth lens element, the fifth lens elementand the sixth lens element can be made of plastic material. When thelens elements are made of glass material, the refractive powerdistribution of the imaging optical lens assembly may be more flexibleto design. When the lens elements are made of plastic material,manufacturing costs can be effectively reduced. Furthermore, surfaces ofeach lens element can be arranged to be aspheric, since the asphericsurface of the lens element is easy to form a shape other than aspherical surface so as to have more controllable variables foreliminating aberrations thereof and to further decrease the requirednumber of the lens elements. Therefore, the total track length of theimaging optical lens assembly can also be reduced.

According to the present disclosure, each of an object-side surface andan image-side surface of a lens element has a paraxial region and anoff-axial region. The paraxial region refers to the region of thesurface where light rays travel close to the optical axis, and theoff-axial region refers to the region of the surface away from theparaxial region. Particularly unless otherwise stated, when the lenselement has a convex surface, it indicates that the surface can beconvex in the paraxial region thereof; when the lens element has aconcave surface, it indicates that the surface can be concave in theparaxial region thereof. Moreover, when a region of refractive power orfocus of a lens element is not defined, it indicates that the region ofrefractive power or focus of the lens element can be in the paraxialregion thereof.

According to the present disclosure, an image surface of the imagingoptical lens assembly on a corresponding image sensor can be flat orcurved, particularly a concave curved surface facing towards the objectside of the imaging optical lens assembly.

According to the present disclosure, the imaging optical lens assemblycan include at least one stop, such as an aperture stop, a glare stop ora field stop. Said glare stop or said field stop is allocated foreliminating the stray light and thereby improving the image qualitythereof.

According to the present disclosure, an aperture stop can be configuredas a front stop or a middle stop. A front stop disposed between theimaged object and the first lens element can produce a telecentriceffect by providing a longer distance between an exit pupil and theimage surface, thereby improving the image-sensing efficiency of animage sensor (for example, CCD or CMOS). A middle stop disposed betweenthe first lens element and the image surface is favorable for enlargingthe view angle and thereby provides a wider field of view.

According to the present disclosure, an image capturing unit includesthe aforementioned imaging optical lens assembly and image sensor,wherein the image sensor is disposed on the image side and can belocated on or near the image surface of the aforementioned imagingoptical lens assembly. In some embodiments, the image capturing unit canfurther include a barrel member, a holding member or a combinationthereof.

In FIG. 22, FIG. 23 and FIG. 24, an image capturing unit 10 may beinstalled in, but not limited to, an electronic device, including avehicle backup camera (FIG. 22), a surveillance device (FIG. 23) or adashboard camera (FIG. 24). The electronic devices shown in the figuresare only exemplary for showing the image capturing unit of the presentdisclosure installed in an electronic device and are not limitedthereto. In some embodiments, the electronic device can further include,but not limited to, a display unit, a control unit, a storage unit, arandom access memory unit (RAM), a read only memory unit (ROM) or acombination thereof.

According to the present disclosure, the imaging optical lens assemblycan be optionally applied to optical systems with a movable focus.Furthermore, the imaging optical lens assembly is featured with goodcapability in aberration corrections and high image quality, and can beapplied to 3D (three-dimensional) image capturing applications, inproducts such as such as digital cameras, mobile devices, digitaltablets, wearable devices, smart televisions, network surveillancedevices, motion sensing input devices, dashboard cameras, vehicle backupcameras and other electronic imaging devices. According to the abovedescription of the present disclosure, the following specificembodiments are provided for further explanation.

1st Embodiment

FIG. 1 is a schematic view of an image capturing unit according to the1st embodiment of the present disclosure. FIG. 2 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 1stembodiment. In FIG. 1, the image capturing unit includes the imagingoptical lens assembly (its reference numeral is omitted) of the presentdisclosure and an image sensor 190. The imaging optical lens assemblyincludes, in order from an object side to an image side, a first lenselement 110, a second lens element 120, a third lens element 130, afourth lens element 140, an aperture stop 100, a fifth lens element 150,a sixth lens element 160, an IR-cut filter 170, a cover-glass 175 and animage surface 180, wherein the imaging optical lens assembly has a totalof six lens elements (110-160), and the fifth lens element 150 and thesixth lens element 160 are cemented together.

The first lens element 110 with negative refractive power has anobject-side surface 111 being convex in a paraxial region thereof and animage-side surface 112 being concave in a paraxial region thereof. Thefirst lens element 110 is made of glass material and has the object-sidesurface 111 and the image-side surface 112 being both spherical.

The second lens element 120 with negative refractive power has anobject-side surface 121 being convex in a paraxial region thereof and animage-side surface 122 being concave in a paraxial region thereof. Thesecond lens element 120 is made of plastic material and has theobject-side surface 121 and the image-side surface 122 being bothaspheric.

The third lens element 130 with negative refractive power has anobject-side surface 131 being concave in a paraxial region thereof andan image-side surface 132 being concave in a paraxial region thereof.The third lens element 130 is made of plastic material and has theobject-side surface 131 and the image-side surface 132 being bothaspheric. The image-side surface 132 of the third lens element 130 hasat least one inflection point.

The fourth lens element 140 with positive refractive power has anobject-side surface 141 being convex in a paraxial region thereof and animage-side surface 142 being convex in a paraxial region thereof. Thefourth lens element 140 is made of plastic material and has theobject-side surface 141 and the image-side surface 142 being bothaspheric.

The fifth lens element 150 with negative refractive power has anobject-side surface 151 being convex in a paraxial region thereof and animage-side surface 152 being concave in a paraxial region thereof. Thefifth lens element 150 is made of plastic material and has theobject-side surface 151 and the image-side surface 152 being bothaspheric.

The sixth lens element 160 with positive refractive power has anobject-side surface 161 being convex in a paraxial region thereof and animage-side surface 162 being convex in a paraxial region thereof. Thesixth lens element 160 is made of plastic material and has theobject-side surface 161 and the image-side surface 162 being bothaspheric.

In this embodiment, the image-side surface 152 of the fifth lens element150 and the object-side surface 161 of the sixth lens element 160 arecemented together.

The IR-cut filter 170 and the cover-glass 175 both are made of glassmaterial and located between the sixth lens element 160 and the imagesurface 180, and will not affect the focal length of the imaging opticallens assembly. The image sensor 190 is disposed on or near the imagesurface 180 of the imaging optical lens assembly.

The equation of the aspheric surface profiles of the aforementioned lenselements of the 1st embodiment is expressed as follows:

${{X(Y)} = {{\left( {Y^{2}/R} \right)/\left( {1 + {{sqrt}\left( {1 - {\left( {1 + k} \right) \times \left( {Y/R} \right)^{2}}} \right)}} \right)} + {\sum\limits_{i}{({Ai}) \times \left( Y^{i} \right)}}}},$where,

X is the relative distance between a point on the aspheric surfacespaced at a distance Y from an optical axis and the tangential plane atthe aspheric surface vertex on the optical axis;

Y is the vertical distance from the point on the aspheric surface to theoptical axis;

R is the curvature radius;

k is the conic coefficient; and

Ai is the i-th aspheric coefficient, and in the embodiments, i may be,but is not limited to, 4, 6, 8, 10, 12, 14 and 16.

In the imaging optical lens assembly of the image capturing unitaccording to the 1st embodiment, when a focal length of the imagingoptical lens assembly is f, an f-number of the imaging optical lensassembly is Fno, and half of a maximal field of view of the imagingoptical lens assembly is HFOV, these parameters have the followingvalues: f=1.05 millimeters (mm); Fno=2.00; and HFOV=96.5 degrees (deg.).

When half of the maximal field of view of the imaging optical lensassembly is HFOV, the following condition is satisfied:|1/tan(HFOV)|=0.11.

When a central thickness of the second lens element 120 is CT2, an axialdistance between the second lens element 120 and the third lens element130 is T23, the following condition is satisfied: T23/CT2=1.67.

When a central thickness of the fifth lens element 150 is CT5, a centralthickness of the sixth lens element 160 is CT6, the following conditionis satisfied: CT6/CT5=2.60.

When an entrance pupil diameter of the imaging optical lens assembly isEPD, a curvature radius of the object-side surface 161 of the sixth lenselement 160 is R11, the following condition is satisfied:|R11/EPD|=1.00.

When a curvature radius of the object-side surface 141 of the fourthlens element 140 is R7, a curvature radius of the image-side surface 142of the fourth lens element 140 is R8, the following condition issatisfied: |R7/R8|=0.91.

When a curvature radius of the object-side surface 131 of the third lenselement 130 is R5, a curvature radius of the image-side surface 132 ofthe third lens element 130 is R6, the following condition is satisfied:(R5+R6)/(R5−R6)=−0.74.

When a curvature radius of the object-side surface 161 of the sixth lenselement 160 is R11, a curvature radius of the image-side surface 162 ofthe sixth lens element 160 is R12, the following condition is satisfied:(R11−R12)/(R11+R12)=−1.69.

When a curvature radius of the object-side surface 151 of the fifth lenselement 150 is R9, the curvature radius of the image-side surface 162 ofthe sixth lens element 160 is R12, the following condition is satisfied:(R9+R12)/(R9−R12)=0.13.

When the focal length of the imaging optical lens assembly is f, anaxial distance between the first lens element 110 and the second lenselement 120 is T12, the following condition is satisfied: T12/f=1.66.

When the focal length of the imaging optical lens assembly is f, anaxial distance between the object-side surface 111 of the first lenselement 110 and the image surface 180 is TL, the following condition issatisfied: TL/f=11.28.

When a focal length of the first lens element 110 is f1, a focal lengthof the third lens element 130 is f3, the following condition issatisfied: f1/f3=1.71.

When the focal length of the imaging optical lens assembly is f, thefocal length of the first lens element 110 is f1, a focal length of thesecond lens element 120 is f2, the focal length of the third lenselement 130 is f3, a focal length of the fourth lens element 140 is f4,a focal length of the fifth lens element 150 is f5, a focal length ofthe sixth lens element 160 is f6, a focal length of the i-th lenselement is fi, a sum of absolute values of ratios f/fi is Σ|f/fi|, thefollowing condition is satisfied: Σ|f/fi|=3.05, wherein i=1, 2, 3, 4, 5,6.

When a maximum image height of the imaging optical lens assembly isImgH, an axial distance between the object-side surface 111 of the firstlens element 110 and the image-side surface 162 of the sixth lenselement 160 is Td, the following condition is satisfied: Td/ImgH=5.38.

When a maximum effective radius of the object-side surface 111 of thefirst lens element 110 is Y11, a maximum effective radius of theimage-side surface 162 of the sixth lens element 160 is Y62, thefollowing condition is satisfied: |Y62/Y11|=0.24.

The detailed optical data of the 1st embodiment are shown in Table 1 andthe aspheric surface data are shown in Table 2 below.

TABLE 1 1st Embodiment f = 1.05 mm, Fno = 2.00, HFOV = 96.5 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 13.030 1.050 Glass 1.589 61.3 −6.67 2 2.930 1.734 3 Lens 2 19.129 (ASP) 0.700 Plastic 1.535 55.8 −2.65 41.301 (ASP) 1.169 5 Lens 3 −2.421 (ASP) 0.650 Plastic 1.535 55.8 −3.90 616.459 (ASP) 0.095 7 Lens 4 2.189 (ASP) 1.191 Plastic 1.583 30.2 2.17 8−2.404 (ASP) −0.029  9 Ape. Stop Plano 0.150 10 Lens 5 2.672 (ASP) 0.831Plastic 1.639 23.5 −1.31 11 0.560 (ASP) 0.010 Cemented 1.514 38.8 12Lens 6 0.523 (ASP) 2.160 Plastic 1.535 55.8 1.10 13 −2.045 (ASP) 0.80014 IR-cut filter Plano 0.300 Glass 1.517 64.2 — 15 Plano 0.200 16cover-glass Plano 0.400 Glass 1.517 64.2 17 Plano 0.396 18 Image Plano —Note: Reference wavelength is 587.6 nm (d-line).

TABLE 2 Aspheric Coefficients Surface # 3 4 5 6 7 k = −8.3083E+01−9.7500E−02 −7.9548E+00 −2.5526E+01 −8.7862E−01 A4 = −2.2710E−04−4.5986E−02 −1.8914E−01 −1.3362E−01 −3.6003E−02 A6 =   8.8119E−04−1.6728E−02   5.2716E−02   4.6510E−02   1.0795E−02 Surface # 8 10 11 1213 k = −9.3984E+00 −4.7899E−01 −8.6590E−01 −1.1602E+00 −1.1732E+01 A4 =−7.0989E−03 −2.3832E−02 −5.6676E−01 −1.0230E+00 −1.1066E−01 A6 =−3.9076E−03 −5.4666E−03   8.2305E−01   3.1383E+00   1.1440E−01 A8 = — —−9.7455E−01 −4.3462E+00 −7.2163E−02 A10 = — —   6.0386E−01   2.8781E+00  2.4733E−02 A12 = — — −1.5448E−01 −7.3838E−01 −3.7985E−03

In Table 1, the curvature radius, the thickness and the focal length areshown in millimeters (mm). Surface numbers 0-18 represent the surfacessequentially arranged from the object-side to the image-side along theoptical axis. In Table 2, k represents the conic coefficient of theequation of the aspheric surface profiles. A4-A12 represent the asphericcoefficients ranging from the 4th order to the 16th order. The tablespresented below for each embodiment are related to the correspondingschematic and aberration curves figures in the drawing, and thedefinitions of the terms in the tables are the same as Table 1 and Table2 of the 1st embodiment. Therefore, an explanation in this regard willnot be provided again.

2nd Embodiment

FIG. 3 is a schematic view of an image capturing unit according to the2nd embodiment of the present disclosure. FIG. 4 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 2ndembodiment. In FIG. 3, the image capturing unit includes the imagingoptical lens assembly (its reference numeral is omitted) of the presentdisclosure and an image sensor 290. The imaging optical lens assemblyincludes, in order from an object side to an image side, a first lenselement 210, a second lens element 220, a third lens element 230, afourth lens element 240, an aperture stop 200, a fifth lens element 250,a sixth lens element 260, an IR-cut filter 270, a cover-glass 275 and animage surface 280, wherein the imaging optical lens assembly has a totalof six lens elements (210-260), and the fifth lens element 250 and thesixth lens element 260 are cemented together.

The first lens element 210 with negative refractive power has anobject-side surface being 211 convex in a paraxial region thereof and animage-side surface 212 being concave in a paraxial region thereof. Thefirst lens element 210 is made of glass material and has the object-sidesurface 211 and the image-side surface 212 being both spherical.

The second lens element 220 with negative refractive power has anobject-side surface 221 being convex in a paraxial region thereof and animage-side surface 222 being concave in a paraxial region thereof. Thesecond lens element 220 is made of plastic material and has theobject-side surface 221 and the image-side surface 222 being bothaspheric.

The third lens element 230 with negative refractive power has anobject-side surface 231 being concave in a paraxial region thereof andan image-side surface 232 being concave in a paraxial region thereof.The third lens element 230 is made of plastic material and has theobject-side surface 231 and the image-side surface 232 being bothaspheric. The image-side surface 232 of the third lens element 230 hasat least one inflection point.

The fourth lens element 240 with positive refractive power has anobject-side surface 241 being convex in a paraxial region thereof and animage-side surface 242 being convex in a paraxial region thereof. Thefourth lens element 240 is made of plastic material and has theobject-side surface 241 and the image-side surface 242 being bothaspheric.

The fifth lens element 250 with negative refractive power has anobject-side surface 251 being convex in a paraxial region thereof and animage-side surface 252 being concave in a paraxial region thereof. Thefifth lens element 250 is made of plastic material and has theobject-side surface 251 and the image-side surface 252 being bothaspheric.

The sixth lens element 260 with positive refractive power has anobject-side surface 261 being convex in a paraxial region thereof and animage-side surface 262 being convex in a paraxial region thereof. Thesixth lens element 260 is made of plastic material and has theobject-side surface 261 and the image-side surface 262 being bothaspheric.

In this embodiment, the image-side surface 252 of the fifth lens element250 and the object-side surface 261 of the sixth lens element 260 arecemented together.

The IR-cut filter 270 and the cover-glass 275 both are made of glassmaterial and located between the sixth lens element 260 and the imagesurface 280, and will not affect the focal length of the imaging opticallens assembly. The image sensor 290 is disposed on or near the imagesurface 280 of the imaging optical lens assembly.

The detailed optical data of the 2nd embodiment are shown in Table 3 andthe aspheric surface data are shown in Table 4 below.

TABLE 3 2nd Embodiment f = 1.06 mm, Fno = 2.00, HFOV = 96.5 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 13.030 1.050 Glass 1.589 61.3 −6.72 2 2.945 1.785 3 Lens 2 38.615 (ASP) 0.700 Plastic 1.535 55.8 −2.68 41.371 (ASP) 1.188 5 Lens 3 −2.305 (ASP) 0.650 Plastic 1.535 55.8 −3.83 620.000 (ASP) 0.096 7 Lens 4 2.243 (ASP) 1.038 Plastic 1.583 30.2 2.12 8−2.288 (ASP) 0.070 9 Ape. Stop Plano 0.215 10 Lens 5 2.777 (ASP) 0.699Plastic 1.639 23.5 −1.30 11 0.578 (ASP) 0.010 Cemented 1.514 38.8 12Lens 6 0.542 (ASP) 2.120 Plastic 1.535 55.8 1.12 13 −2.120 (ASP) 0.80014 IR-cut filter Plano 0.300 Glass 1.517 64.2 — 15 Plano 0.200 16cover-glass Plano 0.400 Glass 1.517 64.2 17 Plano 0.481 18 Image Plano —Note: Reference wavelength is 587.6 nm (d-line).

TABLE 4 Aspheric Coefficients Surface # 3 4 5 6 7 k = 5.1973E+01−1.0911E−02 −6.6135E+00 8.0019E+01 −1.0174E+00 A4 = 7.7033E−04−3.9849E−02 −1.8397E−01 −1.3373E−01  −3.4727E−02 A6 = 6.9409E−04−1.3512E−02  4.8583E−02 4.0194E−02  7.2045E−03 Surface # 8 10 11 12 13 k= −7.3486E+00  6.7376E−03 −8.5285E−01 −1.0846E+00 −1.1732E+01 A4 = 5.1051E−03 −2.2498E−02 −5.0621E−01 −9.4166E−01 −1.0554E−01 A6 =−7.9234E−03 −3.9454E−03  6.5673E−01  2.5888E+00  1.1353E−01 A8 = — —−7.2263E−01 −3.3215E+00 −7.5761E−02 A10 = — —  4.1633E−01  2.0647E+00 2.8205E−02 A12 = — — −1.0131E−01 −5.0687E−01 −4.6710E−03

In the 2nd embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 2nd embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 3 and Table 4 asthe following values and satisfy the following conditions:

2nd Embodiment f [mm] 1.06 (R11 − R12)/(R11 + R12) −1.69 Fno 2.00 (R9 +R12)/(R9 − R12) 0.13 HFOV [deg.] 96.5 T12/f 1.68 |1/tan(HFOV)| 0.11 TL/f11.13 T23/CT2 1.70 f1/f3 1.76 CT6/CT5 3.03 Σ|f/fi| 3.09 |R11/EPD| 1.00Td/ImgH 5.33 |R7/R8| 0.98 |Y62/Y11| 0.24 (R5 + R6)/(R5 − R6) −0.79 — —

3rd Embodiment

FIG. 5 is a schematic view of an image capturing unit according to the3rd embodiment of the present disclosure. FIG. 6 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 3rdembodiment. In FIG. 5, the image capturing unit includes the imagingoptical lens assembly (its reference numeral is omitted) of the presentdisclosure and an image sensor 390. The imaging optical lens assemblyincludes, in order from an object side to an image side, a first lenselement 310, a second lens element 320, a third lens element 330, afourth lens element 340, an aperture stop 300, a fifth lens element 350,a sixth lens element 360, an IR-cut filter 370, a cover-glass 375 and animage surface 380, wherein the imaging optical lens assembly has a totalof six lens elements (310-360), and the fifth lens element 350 and thesixth lens element 360 are cemented together.

The first lens element 310 with negative refractive power has anobject-side surface 311 being convex in a paraxial region thereof and animage-side surface 312 being concave in a paraxial region thereof. Thefirst lens element 310 is made of plastic material and has theobject-side surface 311 and the image-side surface 312 being bothaspheric.

The second lens element 320 with negative refractive power has anobject-side surface 321 being concave in a paraxial region thereof andan image-side surface 322 being concave in a paraxial region thereof.The second lens element 320 is made of plastic material and has theobject-side surface 321 and the image-side surface 322 being bothaspheric. The object-side surface 321 of the second lens element 320 hasat least one inflection point.

The third lens element 330 with negative refractive power has anobject-side surface 331 being concave in a paraxial region thereof andan image-side surface 332 being concave in a paraxial region thereof.The third lens element 330 is made of plastic material and has theobject-side surface 331 and the image-side surface 332 being bothaspheric. The image-side surface 332 of the third lens element 330 hasat least one inflection point.

The fourth lens element 340 with positive refractive power has anobject-side surface 341 being convex in a paraxial region thereof and animage-side surface 342 being convex in a paraxial region thereof. Thefourth lens element 340 is made of plastic material and has theobject-side surface 341 and the image-side surface 342 being bothaspheric.

The fifth lens element 350 with negative refractive power has anobject-side surface 351 being convex in a paraxial region thereof and animage-side surface 352 being concave in a paraxial region thereof. Thefifth lens element 350 is made of plastic material and has theobject-side surface 351 and the image-side surface 352 being bothaspheric.

The sixth lens element 360 with positive refractive power has anobject-side surface 361 being convex in a paraxial region thereof and animage-side surface 362 being convex in a paraxial region thereof. Thesixth lens element 360 is made of plastic material and has theobject-side surface 361 and the image-side surface 362 being bothaspheric.

In this embodiment, the image-side surface 352 of the fifth lens element350 and the object-side surface 361 of the sixth lens element 360 arecemented together.

The IR-cut filter 370 and the cover-glass 375 both are made of glassmaterial and located between the sixth lens element 360 and the imagesurface 380, and will not affect the focal length of the imaging opticallens assembly. The image sensor 390 is disposed on or near the imagesurface 380 of the imaging optical lens assembly.

The detailed optical data of the 3rd embodiment are shown in Table 5 andthe aspheric surface data are shown in Table 6 below.

TABLE 5 3rd Embodiment f = 1.17 mm, Fno = 2.45, HFOV = 87.5 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 12.774 (ASP) 1.081 Plastic 1.544 55.9−8.53 2 3.301 (ASP) 2.087 3 Lens 2 −8.333 (ASP) 0.618 Plastic 1.583 30.2−2.3 4 1.644 (ASP) 1.099 5 Lens 3 −2.818 (ASP) 0.600 Plastic 1.544 55.9−4.96 6 66.662 (ASP) 0.120 7 Lens 4 2.241 (ASP) 1.490 Plastic 1.583 30.22.62 8 −3.635 (ASP) 0.267 9 Ape. Stop Plano 0.121 10 Lens 5 2.480 (ASP)0.866 Plastic 1.639 23.3 −1.62 11 0.631 (ASP) 0.010 Cemented 1.514 38.812 Lens 6 0.600 (ASP) 1.953 Plastic 1.544 55.9 1.14 13 −2.558 (ASP)0.800 14 IR-cut filter Plano 0.300 Glass 1.517 64.2 — 15 Plano 0.200 16cover-glass Plano 0.400 Glass 1.517 64.2 17 Plano 0.794 18 Image Plano —Note: Reference wavelength is 587.6 nm (d-line).

TABLE 6 Aspheric Coefficients Surface # 1 2 3 4 5 6 k =  5.1796E−01−4.5196E−02 −9.2518E+00  2.4749E−01 −8.1481E+00  7.6168E+01 A4 =−6.6559E−05  9.0914E−03 3.9039E−03 −1.4189E−01  −1.9322E−01 −8.7966E−02A6 = −7.5599E−07 −1.9595E−03 8.4764E−04 1.2845E−01  5.2857E−02 5.5359E−02 A8 =  1.6617E−08  6.7865E−05 −9.1840E−05  −8.5099E−02  2.3235E−02 −1.5005E−02 A10 = — — 5.5381E−06 1.8465E−02 −1.3423E−02−1.0201E−03 Surface # 7 8 10 11 12 13 k = −6.8040E−01 −2.3534E+01−8.8079E−01 −8.5377E−01 −1.3932E+00 −1.2849E+01 A4 =  2.3049E−03−2.9902E−02 −7.4253E−02 −2.6415E−01 −1.7272E−01 −5.3799E−02 A6 =−7.6751E−03  2.3085E−02  4.0193E−01 −3.3960E−02 −3.0255E−01  9.5972E−03A8 = −6.2785E−03 −4.1669E−02 −1.4398E+00  6.8664E−01  2.6177E+00 2.0605E−02 A10 =  6.2986E−04  1.7787E−02  2.2492E+00 −9.7798E−01−3.4665E+00 −1.2083E−02 A12 = — — −1.3054E+00  3.8828E−01  1.3313E+00 1.1335E−03

In the 3rd embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 3rd embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 5 and Table 6 asthe following values and satisfy the following conditions:

3rd Embodiment f [mm] 1.17 (R11 − R12)/(R11 + R12) −1.61 Fno 2.45 (R9 +R12)/(R9 − R12) −0.02 HFOV [deg.] 87.5 T12/f 1.78 |1/tan(HFOV)| 0.04TL/fs 10.95 T23/CT2 1.78 f1/f3 1.72 CT6/CT5 2.26 Σ|f/fi| 3.07 |R11/EPD|1.26 Td/ImgH 5.72 |R7/R8| 0.62 |Y62/Y11| 0.24 (R5 + R6)/(R5 − R6) −0.92— —

4th Embodiment

FIG. 7 is a schematic view of an image capturing unit according to the4th embodiment of the present disclosure. FIG. 8 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 4thembodiment. In FIG. 7, the image capturing unit includes the imagingoptical lens assembly (its reference numeral is omitted) of the presentdisclosure and an image sensor 490. The imaging optical lens assemblyincludes, in order from an object side to an image side, a first lenselement 410, a second lens element 420, a third lens element 430, afourth lens element 440, an aperture stop 400, a fifth lens element 450,a sixth lens element 460, an IR-cut filter 470, a cover-glass 475 and animage surface 480, wherein the imaging optical lens assembly has a totalof six lens elements (410-460), and the fifth lens element 450 and thesixth lens element 460 are cemented together.

The first lens element 410 with negative refractive power has anobject-side surface 411 being concave in a paraxial region thereof andan image-side surface 412 being concave in a paraxial region thereof.The first lens element 410 is made of plastic material and has theobject-side surface 411 and the image-side surface 412 being bothaspheric.

The second lens element 420 with negative refractive power has anobject-side surface 421 being concave in a paraxial region thereof andan image-side surface 422 being concave in a paraxial region thereof.The second lens element 420 is made of plastic material and has theobject-side surface 421 and the image-side surface 422 being bothaspheric. The object-side surface 421 of the second lens element 420 hasat least one inflection point.

The third lens element 430 with negative refractive power has anobject-side surface 431 being concave in a paraxial region thereof andan image-side surface 432 being convex in a paraxial region thereof. Thethird lens element 430 is made of plastic material and has theobject-side surface 431 and the image-side surface 432 being bothaspheric.

The fourth lens element 440 with positive refractive power has anobject-side surface 441 being convex in a paraxial region thereof and animage-side surface 442 being convex in a paraxial region thereof. Thefourth lens element 440 is made of plastic material and has theobject-side surface 441 and the image-side surface 442 being bothaspheric.

The fifth lens element 450 with negative refractive power has anobject-side surface 451 being convex in a paraxial region thereof and animage-side surface 452 being concave in a paraxial region thereof. Thefifth lens element 450 is made of plastic material and has theobject-side surface 451 and the image-side surface 452 being bothaspheric.

The sixth lens element 460 with positive refractive power has anobject-side surface 461 being convex in a paraxial region thereof and animage-side surface 462 being convex in a paraxial region thereof. Thesixth lens element 460 is made of plastic material and has theobject-side surface 461 and the image-side surface 462 being bothaspheric.

In this embodiment, the image-side surface 452 of the fifth lens element450 and the object-side surface 461 of the sixth lens element 460 arecemented together.

The IR-cut filter 470 and the cover-glass 475 both are made of glassmaterial and located between the sixth lens element 460 and the imagesurface 480, and will not affect the focal length of the imaging opticallens assembly. The image sensor 490 is disposed on or near the imagesurface 480 of the imaging optical lens assembly.

The detailed optical data of the 4th embodiment are shown in Table 7 andthe aspheric surface data are shown in Table 8 below.

TABLE 7 4th Embodiment f = 1.44 mm, Fno = 2.60, HFOV = 70.0 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 −153.397 (ASP) 1.794 Plastic 1.544 55.9−8.66 2 4.902 (ASP) 1.795 3 Lens 2 −12.473 (ASP) 0.604 Plastic 1.58330.2 −2.34 4 1.578 (ASP) 0.976 5 Lens 3 −2.646 (ASP) 0.608 Plastic 1.54455.9 −5.34 6 −30.705 (ASP) 0.051 7 Lens 4 2.542 (ASP) 0.900 Plastic1.583 30.2 2.64 8 −3.481 (ASP) 0.667 9 Ape. Stop Plano 0.082 10 Lens 52.437 (ASP) 1.102 Plastic 1.639 23.5 −1.61 11 0.598 (ASP) 0.010 Cemented1.514 38.8 12 Lens 6 0.556 (ASP) 2.496 Plastic 1.544 55.9 1.17 13 −2.485(ASP) 0.800 14 IR-cut filter Plano 0.300 Glass 1.517 64.2 — 15 Plano0.200 16 cover-glass Plano 0.400 Glass 1.517 64.2 17 Plano 0.896 18Image Plano — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 8 Aspheric Coefficients Surface # 1 2 3 4 5 6 k =  2.1300E+01−6.4080E−02 −7.0777E+00 2.1377E−01 −6.9223E+00 7.7932E+01 A4 =−5.3702E−05  6.1866E−03  1.6477E−02 −1.5532E−01  −1.9696E−01−8.2747E−02  A6 = −4.8497E−07 −1.3596E−03 −4.2308E−03 1.4279E−01 4.5184E−02 5.2256E−02 A8 = −3.7403E−09  4.2334E−05  6.4613E−04−1.1174E−01   5.1805E−02 −2.0191E−02  A10 = — — −4.1568E−05 3.1052E−02−3.2080E−02 2.5532E−03 Surface # 7 8 10 11 12 13 k =  5.6170E−02−2.1137E+01 −7.5257E−01 −8.4736E−01 −1.3887E+00 −1.2986E+01 A4 = 3.0584E−03 −4.9206E−02 −4.4744E−02 −3.0613E−01 −6.8637E−01 −3.0906E−02A6 = −1.1460E−02  4.6971E−02  7.5785E−02  2.9385E−01  3.1065E+00 2.7998E−04 A8 = −1.0293E−03 −3.2837E−02 −3.7565E−01 −1.3220E−01−4.8724E+00  1.6576E−02 A10 = −1.6368E−03  5.7262E−03  8.4748E−01−6.7252E−02  3.3798E+00 −8.8032E−03 A12 = — — −6.5916E−01  2.2056E−02−8.8509E−01  9.5231E−04

In the 4th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 4th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 7 and Table 8 asthe following values and satisfy the following conditions:

4th Embodiment f [mm] 1.44 (R11 − R12)/(R11 + R12) −1.58 Fno 2.60 (R9 +R12)/(R9 − R12) −0.01 HFOV [deg.] 70.0 T12/f 1.25 |1/tan(HFOV)| 0.36TL/f 9.50 T23/CT2 1.62 f1/f3 1.62 CT6/CT5 2.26 Σ|f/fi| 3.72 |R11/EPD|1.00 Td/ImgH 6.29 |R7/R8| 0.73 |Y62/Y11| 0.30 (R5 + R6)/(R5 − R6) −1.19— —

5th Embodiment

FIG. 9 is a schematic view of an image capturing unit according to the5th embodiment of the present disclosure. FIG. 10 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 5thembodiment. In FIG. 9, the image capturing unit includes the imagingoptical lens assembly (its reference numeral is omitted) of the presentdisclosure and an image sensor 590. The imaging optical lens assemblyincludes, in order from an object side to an image side, a first lenselement 510, a second lens element 520, a third lens element 530, afourth lens element 540, an aperture stop 500, a fifth lens element 550,a sixth lens element 560, an IR-cut filter 570, a cover-glass 575 and animage surface 580, wherein the imaging optical lens assembly has a totalof six lens elements (510-560), and the fifth lens element 550 and thesixth lens element 560 are cemented together.

The first lens element 510 with negative refractive power has anobject-side surface being 511 convex in a paraxial region thereof and animage-side surface 512 being concave in a paraxial region thereof. Thefirst lens element 510 is made of glass material and has the object-sidesurface 511 and the image-side surface 512 being both spherical.

The second lens element 520 with negative refractive power has anobject-side surface 521 being concave in a paraxial region thereof andan image-side surface 522 being concave in a paraxial region thereof.The second lens element 520 is made of plastic material and has theobject-side surface 521 and the image-side surface 522 being bothaspheric. The object-side surface 521 of the second lens element 520 hasat least one inflection point.

The third lens element 530 with negative refractive power has anobject-side surface 531 being concave in a paraxial region thereof andan image-side surface 532 being convex in a paraxial region thereof. Thethird lens element 530 is made of plastic material and has theobject-side surface 531 and the image-side surface 532 being bothaspheric.

The fourth lens element 540 with positive refractive power has anobject-side surface 541 being convex in a paraxial region thereof and animage-side surface 542 being convex in a paraxial region thereof. Thefourth lens element 540 is made of plastic material and has theobject-side surface 541 and the image-side surface 542 being bothaspheric.

The fifth lens element 550 with negative refractive power has anobject-side surface 551 being convex in a paraxial region thereof and animage-side surface 552 being concave in a paraxial region thereof. Thefifth lens element 550 is made of plastic material and has theobject-side surface 551 and the image-side surface 552 being bothaspheric.

The sixth lens element 560 with positive refractive power has anobject-side surface 561 being convex in a paraxial region thereof and animage-side surface 562 being convex in a paraxial region thereof. Thesixth lens element 560 is made of plastic material and has theobject-side surface 561 and the image-side surface 562 being bothaspheric.

In this embodiment, the image-side surface 552 of the fifth lens element550 and the object-side surface 561 of the sixth lens element 560 arecemented together.

The IR-cut filter 570 and the cover-glass 575 both are made of glassmaterial and located between the sixth lens element 560 and the imagesurface 580, and will not affect the focal length of the imaging opticallens assembly. The image sensor 590 is disposed on or near the imagesurface 580 of the imaging optical lens assembly.

The detailed optical data of the 5th embodiment are shown in Table 9 andthe aspheric surface data are shown in Table 10 below.

TABLE 9 5th Embodiment f = 1.08 mm, Fno = 1.90, HFOV = 94.5 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 12.980 1.050 Glass 1.589 61.3 −6.88 2 2.996 1.912 3 Lens 2 −23.584 (ASP) 0.650 Plastic 1.544 55.9 −2.7 41.578 (ASP) 1.150 5 Lens 3 −2.515 (ASP) 0.650 Plastic 1.544 55.9 −5.36 6−20.061 (ASP) 0.050 7 Lens 4 3.096 (ASP) 1.580 Plastic 1.583 30.2 3.24 8−3.931 (ASP) −0.050  9 Ape. Stop Plano 0.120 10 Lens 5 2.062 (ASP) 0.954Plastic 1.650 21.5 −2.30 11 0.709 (ASP) 0.010 Cemented 1.514 38.8 12Lens 6 0.592 (ASP) 2.247 Plastic 1.544 55.9 1.19 13 −2.461 (ASP) 0.80014 IR-cut filter Plano 0.300 Glass 1.517 64.2 — 15 Plano 0.200 16Cover-glass Plano 0.400 Glass 1.517 64.2 17 Plano 0.457 18 Image Plano —Note: Reference wavelength is 587.6 nm (d-line).

TABLE 10 Aspheric Coefficients Surface # 3 4 5 6 7 k = 1.1803E+012.1732E−01 −1.5535E+01 9.0000E+01 7.0051E−01 A4 = 2.3802E−03−6.5399E−02  −2.5079E−01 −5.8486E−02  2.0236E−02 A6 = 1.6617E−035.7339E−03  1.5608E−01 4.3632E−02 −3.1239E−02  A8 = −2.0167E−04 −7.3204E−03  −4.8266E−02 −2.0412E−02  6.7073E−03 A10 = 1.2094E−052.0883E−03  3.7221E−03 1.9071E−03 −2.2735E−03  Surface # 8 10 11 12 13 k= −8.4256E+00 −8.7038E−01 −7.8615E−01 −3.5314E+00 −1.1968E+01 A4 =−3.6017E−02 −5.0231E−02 −2.3087E−01  4.6334E−01 −5.4384E−02 A6 = 3.5178E−02  5.2399E−02  4.1827E−01 −3.4821E−02  4.9935E−02 A8 =−3.9444E−02 −7.1202E−02 −6.4824E−01 −7.4039E−01 −2.5874E−02 A10 = 1.5841E−02  5.1794E−02  4.8141E−01  8.4436E−01  7.1057E−03 A12 = —−1.5447E−02 −1.3515E−01 −2.7438E−01 −9.9491E−04

In the 5th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 5th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 9 and Table 10as the following values and satisfy the following conditions:

5th Embodiment f [mm] 1.08 (R11 − R12)/(R11 + R12) −1.63 Fno 1.90 (R9 +R12)/(R9 − R12) −0.09 HFOV [deg.] 94.5 T12/f 1.77 |1/tan(HFOV)| 0.08TL/f 11.58 T23/CT2 1.77 f1/f3 1.28 CT6/CT5 2.36 Σ|f/fi| 2.47 |R11/EPD|1.04 Td/ImgH 5.73 |R7/R8| 0.79 |Y62/Y11| 0.25 (R5 + R6)/(R5 − R6) −1.29— —

6th Embodiment

FIG. 11 is a schematic view of an image capturing unit according to the6th embodiment of the present disclosure. FIG. 12 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 6thembodiment. In FIG. 11, the image capturing unit includes the imagingoptical lens assembly (its reference numeral is omitted) of the presentdisclosure and an image sensor 690. The imaging optical lens assemblyincludes, in order from an object side to an image side, a first lenselement 610, a second lens element 620, a third lens element 630, afourth lens element 640, an aperture stop 600, a fifth lens element 650,a sixth lens element 660, an IR-cut filter 670, a cover-glass 675 and animage surface 680, wherein the imaging optical lens assembly has a totalof six lens elements (610-660), and the fifth lens element 650 and thesixth lens element 660 are cemented together.

The first lens element 610 with negative refractive power has anobject-side surface 611 being convex in a paraxial region thereof and animage-side surface 612 being concave in a paraxial region thereof. Thefirst lens element 610 is made of glass material and has the object-sidesurface 611 and the image-side surface 612 being both spherical.

The second lens element 620 with negative refractive power has anobject-side surface 621 being concave in a paraxial region thereof andan image-side surface 622 being concave in a paraxial region thereof.The second lens element 620 is made of plastic material and has theobject-side surface 621 and the image-side surface 622 being bothaspheric. The object-side surface 621 of the second lens element 620 hasat least one inflection point.

The third lens element 630 with negative refractive power has anobject-side surface 631 being concave in a paraxial region thereof andan image-side surface 632 being concave in a paraxial region thereof.The third lens element 630 is made of plastic material and has theobject-side surface 631 and the image-side surface 632 being bothaspheric. The image-side surface 632 of the third lens element 630 hasat least one inflection point.

The fourth lens element 640 with positive refractive power has anobject-side surface 641 being convex in a paraxial region thereof and animage-side surface 642 being convex in a paraxial region thereof. Thefourth lens element 640 is made of plastic material and has theobject-side surface 641 and the image-side surface 642 being bothaspheric.

The fifth lens element 650 with negative refractive power has anobject-side surface 651 being convex in a paraxial region thereof and animage-side surface 652 being concave in a paraxial region thereof. Thefifth lens element 650 is made of plastic material and has theobject-side surface 651 and the image-side surface 652 being bothaspheric.

The sixth lens element 660 with positive refractive power has anobject-side surface 661 being convex in a paraxial region thereof and animage-side surface 662 being convex in a paraxial region thereof. Thesixth lens element 660 is made of plastic material and has theobject-side surface 661 and the image-side surface 662 being bothaspheric.

In this embodiment, the image-side surface 652 of the fifth lens element650 and the object-side surface 661 of the sixth lens element 660 arecemented together.

The IR-cut filter 670 and the cover-glass 675 both are made of glassmaterial and located between the sixth lens element 660 and the imagesurface 680, and will not affect the focal length of the imaging opticallens assembly. The image sensor 690 is disposed on or near the imagesurface 680 of the imaging optical lens assembly.

The detailed optical data of the 6th embodiment are shown in Table 11and the aspheric surface data are shown in Table 12 below.

TABLE 11 6th Embodiment f = 1.05 mm, Fno = 1.90, HFOV = 98.0 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 13.030 1.050 Glass 1.589 61.3 −6.76 2 2.958 1.897 3 Lens 2 −24.503 (ASP) 0.650 Plastic 1.583 30.2 −2.52 41.579 (ASP) 1.117 5 Lens 3 −2.412 (ASP) 0.650 Plastic 1.544 55.9 −3.81 615.922 (ASP) 0.050 7 Lens 4 2.302 (ASP) 1.557 Plastic 1.583 30.2 2.76 8−4.023 (ASP) −0.050  9 Ape. Stop Plano 0.179 10 Lens 5 1.866 (ASP) 1.190Plastic 1.650 21.5 −2.25 11 0.614 (ASP) 0.010 Cemented 1.514 38.8 12Lens 6 0.546 (ASP) 2.625 Plastic 1.544 55.9 1.22 13 −2.144 (ASP) 0.80014 IR-cut filter Plano 0.300 Glass 1.517 64.2 — 15 Plano 0.200 16cover-glass Plano 0.400 Glass 1.517 64.2 17 Plano 0.052 18 Image Plano —Note: Reference wavelength is 587.6 nm (d-line).

TABLE 12 Aspheric Coefficients Surface # 3 4 5 6 7 k = −3.0933E+01 2.5092E−01 −1.3789E+01 9.0000E+01 4.1250E−01 A4 = 1.9475E−03−6.8570E−02  −2.5907E−01 −5.3424E−02  3.3529E−02 A6 = 1.8765E−032.0533E−02  2.1159E−01 3.7366E−02 −6.8507E−02  A8 = −2.7393E−04 −9.8787E−03  −1.1287E−01 −1.9961E−02  4.1903E−02 A10 = 1.8938E−052.1551E−03  2.4429E−02 2.2438E−03 −1.4174E−02  Surface # 8 10 11 12 13 k= −6.9300E+00 −1.4417E+00 −8.3707E−01 −2.2588E+00 −1.1968E+01 A4 =−2.1610E−02 −3.1429E−02  8.1520E−04  8.4273E−01 −6.7817E−02 A6 =−2.0073E−02 −1.7345E−02 −2.9783E−01 −1.6007E+00  4.1441E−02 A8 = 2.5158E−02  5.7039E−03  2.4218E−01  1.6281E+00 −9.4717E−03 A10 =−1.1778E−02  5.9151E−03 −1.1050E−01 −7.7983E−01 −2.4839E−03 A12 = —−5.5757E−03  1.2878E−02  1.3456E−01  1.3847E−03

In the 6th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 6th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 11 and Table 12as the following values and satisfy the following conditions:

6th Embodiment f [mm] 1.05 (R11 − R12)/(R11 + R12) −1.68 Fno 1.90 (R9 +R12)/(R9 − R12) −0.07 HFOV [deg.] 98.0 T12/f 1.81 |1/tan(HFOV)| 0.14TL/f 12.13 T23/CT2 1.72 f1/f3 1.78 CT6/CT5 2.21 Σ|f/fi| 2.55 |R11/EPD|0.99 Td/ImgH 6.05 |R7/R8| 0.57 |Y62/Y11| 0.26 (R5 + R6)/(R5 − R6) −0.74— —

7th Embodiment

FIG. 13 is a schematic view of an image capturing unit according to the7th embodiment of the present disclosure. FIG. 14 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 7thembodiment. In FIG. 13, the image capturing unit includes the imagingoptical lens assembly (its reference numeral is omitted) of the presentdisclosure and an image sensor 790. The imaging optical lens assemblyincludes, in order from an object side to an image side, a first lenselement 710, a second lens element 720, a third lens element 730, afourth lens element 740, an aperture stop 700, a fifth lens element 750,a sixth lens element 760, an IR-cut filter 770, a cover-glass 775 and animage surface 780, wherein the imaging optical lens assembly has a totalof six lens elements (710-760), and the fifth lens element 750 and thesixth lens element 760 are cemented together.

The first lens element 710 with negative refractive power has anobject-side surface 711 being convex in a paraxial region thereof and animage-side surface 712 being concave in a paraxial region thereof. Thefirst lens element 710 is made of glass material and has the object-sidesurface 711 and the image-side surface 712 being both spherical.

The second lens element 720 with negative refractive power has anobject-side surface 721 being concave in a paraxial region thereof andan image-side surface 722 being concave in a paraxial region thereof.The second lens element 720 is made of plastic material and has theobject-side surface 721 and the image-side surface 722 being bothaspheric. The object-side surface 721 of the second lens element 720 hasat least one inflection point.

The third lens element 730 with negative refractive power has anobject-side surface 731 being concave in a paraxial region thereof andan image-side surface 732 being convex in a paraxial region thereof. Thethird lens element 730 is made of plastic material and has theobject-side surface 731 and the image-side surface 732 being bothaspheric.

The fourth lens element 740 with positive refractive power has anobject-side surface 741 being convex in a paraxial region thereof and animage-side surface 742 being concave in a paraxial region thereof. Thefourth lens element 740 is made of plastic material and has theobject-side surface 741 and the image-side surface 742 being bothaspheric.

The fifth lens element 750 with positive refractive power has anobject-side surface 751 being convex in a paraxial region thereof and animage-side surface 752 being convex in a paraxial region thereof. Thefifth lens element 750 is made of plastic material and has theobject-side surface 751 and the image-side surface 752 being bothaspheric.

The sixth lens element 760 with negative refractive power has anobject-side surface 761 being concave in a paraxial region thereof andan image-side surface 762 being convex in a paraxial region thereof. Thesixth lens element 760 is made of plastic material and has theobject-side surface 761 and the image-side surface 762 being bothaspheric.

In this embodiment, the image-side surface 752 of the fifth lens element750 and the object-side surface 761 of the sixth lens element 760 arecemented together.

The IR-cut filter 770 and the cover-glass 775 both are made of glassmaterial and located between the sixth lens element 760 and the imagesurface 780, and will not affect the focal length of the imaging opticallens assembly. The image sensor 790 is disposed on or near the imagesurface 780 of the imaging optical lens assembly.

The detailed optical data of the 7th embodiment are shown in Table 13and the aspheric surface data are shown in Table 14 below.

TABLE 13 7th Embodiment f = 1.20 mm, Fno = 2.60, HFOV = 85.0 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 13.030 1.142 Glass 1.589 61.3 −7.53 2 3.203 1.464 3 Lens 2 −48.293 (ASP) 0.665 Plastic 1.535 55.8 −2.68 41.482 (ASP) 1.081 5 Lens 3 −2.370 (ASP) 0.650 Plastic 1.535 55.8 −5.12 6−19.240 (ASP) 0.050 7 Lens 4 1.735 (ASP) 1.067 Plastic 1.583 30.2 3.86 85.859 (ASP) 0.198 9 Ape. Stop Plano 0.120 10 Lens 5 1.786 (ASP) 2.278Plastic 1.535 55.8 1.30 11 −0.635 (ASP) 0.010 Cemented 1.514 38.8 12Lens 6 −0.657 (ASP) 0.554 Plastic 1.639 23.5 −2.20 13 −1.635 (ASP) 0.80014 IR-cut filter Plano 0.300 Glass 1.517 64.2 — 15 Plano 0.200 16cover-glass Plano 0.400 Glass 1.517 64.2 17 Plano 0.947 18 Image Plano —Note: Reference wavelength is 587.6 nm (d-line).

TABLE 14 Aspheric Coefficients Surface # 3 4 5 6 7 k = 9.0000E+01−2.4294E−01 −1.4078E+01 9.0000E+01 −1.8852E+00 A4 = −1.5619E−03 −5.7832E−02 −2.0040E−01 −1.4099E−01  −4.5312E−02 A6 = 7.9290E−04−1.2954E−02  5.7923E−02 4.3205E−02  9.3130E−03 Surface # 8 10 11 12 13 k= −9.1468E+00 −9.2084E+00 −1.0632E+00 −9.1394E−01 −1.0221E+00 A4 =−1.3549E−02  1.4538E−01 −3.4661E−01 −5.0672E−01 −1.5244E−02 A6 =−7.7731E−03 −3.9641E−01  1.2188E+00  1.5784E+00  9.1928E−02 A8 = — 8.4939E−01 −2.2544E+00 −2.3823E+00 −8.3744E−02 A10 = — −8.0958E−01 1.7448E+00  1.6796E+00  3.7402E−02 A12 = —  9.5934E−02 −4.1609E−01−3.8207E−01 −6.1638E−03

In the 7th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 7th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 13 and Table 14as the following values and satisfy the following conditions:

7th Embodiment f [mm] 1.20 (R11 − R12)/(R11 + R12) −0.43 Fno 2.60 (R9 +R12)/(R9 − R12) 0.04 HFOV [deg.] 85.0 T12/f 1.22 |1/tan(HFOV)| 0.09 TL/f9.94 T23/CT2 1.63 f1/f3 1.47 CT6/CT5 0.24 Σ|f/fi| 2.62 |R11/EPD| 1.42Td/ImgH 5.16 |R7/R8| 0.30 |Y62/Y11| 0.28 (R5 + R6)/(R5 − R6) −1.28 — —

8th Embodiment

FIG. 15 is a schematic view of an image capturing unit according to the8th embodiment of the present disclosure. FIG. 16 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 8thembodiment. In FIG. 15, the image capturing unit includes the imagingoptical lens assembly (its reference numeral is omitted) of the presentdisclosure and an image sensor 890. The imaging optical lens assemblyincludes, in order from an object side to an image side, a first lenselement 810, a second lens element 820, a third lens element 830, afourth lens element 840, an aperture stop 800, a fifth lens element 850,a sixth lens element 860, an IR-cut filter 870, a cover-glass 875 and animage surface 880, wherein the imaging optical lens assembly has a totalof six lens elements (810-860), and the fifth lens element 850 and thesixth lens element 860 are cemented together.

The first lens element 810 with negative refractive power has anobject-side surface 811 being concave in a paraxial region thereof andan image-side surface 812 being concave in a paraxial region thereof.The first lens element 810 is made of plastic material and has theobject-side surface 811 and the image-side surface 812 being bothaspheric.

The second lens element 820 with negative refractive power has anobject-side surface 821 being concave in a paraxial region thereof andan image-side surface 822 being concave in a paraxial region thereof.The second lens element 820 is made of plastic material and has theobject-side surface 821 and the image-side surface 822 being bothaspheric. Each of the object-side surface 821 and the image-side surface822 of the second lens element 820 has at least one inflection point.

The third lens element 830 with negative refractive power has anobject-side surface 831 being concave in a paraxial region thereof andan image-side surface 832 being convex in a paraxial region thereof. Thethird lens element 830 is made of plastic material and has theobject-side surface 831 and the image-side surface 832 being bothaspheric.

The fourth lens element 840 with positive refractive power has anobject-side surface 841 being convex in a paraxial region thereof and animage-side surface 842 being convex in a paraxial region thereof. Thefourth lens element 840 is made of plastic material and has theobject-side surface 841 and the image-side surface 842 being bothaspheric.

The fifth lens element 850 with positive refractive power has anobject-side surface 851 being convex in a paraxial region thereof and animage-side surface 852 being convex in a paraxial region thereof. Thefifth lens element 850 is made of plastic material and has theobject-side surface 851 and the image-side surface 852 being bothaspheric.

The sixth lens element 860 with negative refractive power has anobject-side surface 861 being concave in a paraxial region thereof andan image-side surface 862 being convex in a paraxial region thereof. Thesixth lens element 860 is made of plastic material and has theobject-side surface 861 and the image-side surface 862 being bothaspheric.

In this embodiment, the image-side surface 852 of the fifth lens element850 and the object-side surface 861 of the sixth lens element 860 arecemented together.

The IR-cut filter 870 and the cover-glass 875 both are made of glassmaterial and located between the sixth lens element 860 and the imagesurface 880, and will not affect the focal length of the imaging opticallens assembly. The image sensor 890 is disposed on or near the imagesurface 880 of the imaging optical lens assembly.

The detailed optical data of the 8th embodiment are shown in Table 15and the aspheric surface data are shown in Table 16 below.

TABLE 15 8th Embodiment f = 1.40 mm, Fno = 2.60, HFOV = 73.0 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 −100.000 (ASP) 1.541 Plastic 1.544 55.9−7.92 2 4.524 (ASP) 1.689 3 Lens 2 −63.636 (ASP) 1.171 Plastic 1.54455.9 −2.86 4 1.602 (ASP) 1.140 5 Lens 3 −1.976 (ASP) 0.599 Plastic 1.53555.8 −3.74 6 −166.721 (ASP) 0.050 7 Lens 4 1.443 (ASP) 1.233 Plastic1.583 30.2 2.46 8 −200.000 (ASP) 0.238 9 Ape. Stop Plano 0.317 10 Lens 51.968 (ASP) 1.768 Plastic 1.535 55.8 1.16 11 −0.622 (ASP) 0.010 Cemented1.514 38.8 12 Lens 6 −0.689 (ASP) 1.140 Plastic 1.639 23.5 −1.82 13−2.783 (ASP) 0.909 14 IR-cut filter Plano 0.300 Glass 1.517 64.2 — 15Plano 0.200 16 cover-glass Plano 0.400 Glass 1.517 64.2 17 Plano 0.73118 Image Plano — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 16 Aspheric Coefficients Surface # 1 2 3 4 5 6 k = −2.3563E+01−1.8341E+00  8.0820E+01 −3.0320E−01 −7.9112E+00 8.8125E+01 A4 =−4.4389E−07 2.5198E−04 4.9465E−03 −9.9467E−02 −1.7961E−01 −1.3223E−01 A6 =  7.7748E−06 2.2453E−04 −9.4229E−05   5.7424E−02 −4.3740E−023.2323E−02 A8 = −2.5278E−08 — 2.4467E−04 −4.8915E−02  9.5966E−025.7061E−03 A10 = — — −7.3732E−05   1.1525E−02 −2.6717E−02 −2.3354E−03 Surface # 7 8 10 11 12 13 k = −2.2743E+00 −3.4741E+01 −1.0470E+01−1.2262E+00 −7.7229E−01 −1.2678E+00  A4 = −5.4753E−02 −4.2199E−02 1.1735E−01  1.1634E+00  5.5067E−01 4.9056E−02 A6 =  5.4856E−02 4.4315E−02 −3.0787E−01 −3.3758E+00 −9.2014E−01 1.8194E−02 A8 =−5.4114E−02 −7.5117E−02  5.6642E−01  4.2768E+00  1.6080E+00 −1.9358E−02 A10 =  2.0294E−02  5.4885E−02 −5.2683E−01 −2.5238E+00 −1.5256E+004.7792E−04 A12 = — —  1.9351E−01  3.8156E−01  3.5373E−01 9.7202E−04

In the 8th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 8th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 15 and Table 16as the following values and satisfy the following conditions:

8th Embodiment f [mm] 1.40 (R11 − R12)/(R11 + R12) −0.60 Fno 2.60 (R9 +R12)/(R9 − R12) −0.17 HFOV [deg.] 73.0 T12/f 1.21 |1/tan(HFOV)| 0.31TL/f 9.62 T23/CT2 0.97 f1/f3 2.12 CT6/CT5 0.64 Σ|f/fi| 3.58 |R11/EPD|1.28 Td/ImgH 6.03 |R7/R8| 0.01 |Y62/Y11| 0.28 (R5 + R6)/(R5 − R6) −1.02— —

9th Embodiment

FIG. 17 is a schematic view of an image capturing unit according to the9th embodiment of the present disclosure. FIG. 18 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 9thembodiment. In FIG. 17, the image capturing unit includes the imagingoptical lens assembly (its reference numeral is omitted) of the presentdisclosure and an image sensor 990. The imaging optical lens assemblyincludes, in order from an object side to an image side, a first lenselement 910, a second lens element 920, a third lens element 930, afourth lens element 940, an aperture stop 900, a fifth lens element 950,a sixth lens element 960, an IR-cut filter 970, a cover-glass 975 and animage surface 980, wherein the imaging optical lens assembly has a totalof six lens elements (910-960), and the fifth lens element 950 and thesixth lens element 960 are cemented together.

The first lens element 910 with negative refractive power has anobject-side surface 911 being convex in a paraxial region thereof and animage-side surface 912 being concave in a paraxial region thereof. Thefirst lens element 910 is made of glass material and has the object-sidesurface 911 and the image-side surface 912 being both spherical.

The second lens element 920 with negative refractive power has anobject-side surface 921 being convex in a paraxial region thereof and animage-side surface 922 being concave in a paraxial region thereof. Thesecond lens element 920 is made of plastic material and has theobject-side surface 921 and the image-side surface 922 being bothaspheric. Each of the object-side surface 921 and the image-side surface922 of the second lens element 920 has at least one inflection point.

The third lens element 930 with negative refractive power has anobject-side surface 931 being concave in a paraxial region thereof andan image-side surface 932 being convex in a paraxial region thereof. Thethird lens element 930 is made of plastic material and has theobject-side surface 931 and the image-side surface 932 being bothaspheric.

The fourth lens element 940 with positive refractive power has anobject-side surface 941 being convex in a paraxial region thereof and animage-side surface 942 being concave in a paraxial region thereof. Thefourth lens element 940 is made of plastic material and has theobject-side surface 941 and the image-side surface 942 being bothaspheric.

The fifth lens element 950 with positive refractive power has anobject-side surface 951 being convex in a paraxial region thereof and animage-side surface 952 being convex in a paraxial region thereof. Thefifth lens element 950 is made of plastic material and has theobject-side surface 951 and the image-side surface 952 being bothaspheric.

The sixth lens element 960 with negative refractive power has anobject-side surface 961 being concave in a paraxial region thereof andan image-side surface 962 being convex in a paraxial region thereof. Thesixth lens element 960 is made of plastic material and has theobject-side surface 961 and the image-side surface 962 being bothaspheric.

In this embodiment, the image-side surface 952 of the fifth lens element950 and the object-side surface 961 of the sixth lens element 960 arecemented together.

The IR-cut filter 970 and the cover-glass 975 both are made of glassmaterial and located between the sixth lens element 960 and the imagesurface 980, and will not affect the focal length of the imaging opticallens assembly. The image sensor 990 is disposed on or near the imagesurface 980 of the imaging optical lens assembly.

The detailed optical data of the 9th embodiment are shown in Table 17and the aspheric surface data are shown in Table 18 below.

TABLE 17 9th Embodiment f = 1.20 mm, Fno = 2.45, HFOV = 83.5 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 13.030 1.751 Glass 1.589 61.3 −7.79 2 3.224 1.612 3 Lens 2 99.635 (ASP) 0.809 Plastic 1.535 55.8 −2.77 41.455 (ASP) 1.040 5 Lens 3 −2.248 (ASP) 0.650 Plastic 1.535 55.8 −4.83 6−18.941 (ASP) 0.050 7 Lens 4 1.494 (ASP) 0.856 Plastic 1.583 30.2 3.15 86.285 (ASP) 0.174 9 Ape. Stop Plano 0.184 10 Lens 5 1.710 (ASP) 2.500Plastic 1.535 55.8 1.19 11 −0.500 (ASP) 0.010 Cemented 1.514 38.8 12Lens 6 −0.653 (ASP) 0.385 Plastic 1.639 23.5 −1.94 13 −1.696 (ASP) 0.80014 IR-cut filter Plano 0.300 Glass 1.517 64.2 — 15 Plano 0.200 16cover-glass Plano 0.400 Glass 1.517 64.2 17 Plano 0.365 18 Image Plano —Note: Reference wavelength is 587.6 nm (d-line).

TABLE 18 Aspheric Coefficients Surface # 3 4 5 6 7 k = 9.0000E+01−2.3494E−01 −1.3511E+01 9.0000E+01 −1.7849E+00 A4 = −4.3520E−03 −5.6594E−02 −2.0669E−01 −1.4099E−01  −4.5312E−02 A6 = 7.2127E−04−2.0836E−02  6.0572E−02 4.3205E−02  9.3130E−03 Surface # 8 10 11 12 13 k= −7.5791E+01 −1.0107E+01 −1.1304E+00 −7.9911E−01 −1.0943E+00 A4 =−1.3549E−02  1.2617E−01  1.3725E+00  8.7410E−02 −4.7753E−03 A6 =−7.7731E−03 −9.7441E−02 −3.2845E+00  1.8646E−01  9.5706E−02 A8 = —−6.0318E−01  3.0409E+00 −5.1197E−01 −9.1165E−02 A10 = —  1.7003E+00−1.0938E+00  5.7340E−01  4.2501E−02 A12 = — −1.3833E+00  1.1807E−01−1.6813E−01 −7.6365E−03

In the 9th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 9th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 17 and Table 18as the following values and satisfy the following conditions:

9th Embodiment f [mm] 1.20 (R11 − R12)/(R11 + R12) −0.44 Fno 2.45 (R9 +R12)/(R9 − R12) 0.004 HFOV [deg.] 83.5 T12/f 1.34 |1/tan(HFOV)| 0.11TL/f 10.08 T23/CT2 1.29 f1/f3 1.61 CT6/CT5 0.15 Σ|f/fi| 2.84 |R11/EPD|1.33 Td/ImgH 5.64 |R7/R8| 0.24 |Y62/Y11| 0.26 (R5 + R6)/(R5 − R6) −1.27— —

10th Embodiment

FIG. 19 is a schematic view of an image capturing unit according to the10th embodiment of the present disclosure. FIG. 20 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 10thembodiment. In FIG. 19, the image capturing unit includes the imagingoptical lens assembly (its reference numeral is omitted) of the presentdisclosure and an image sensor 1090. The imaging optical lens assemblyincludes, in order from an object side to an image side, a first lenselement 1010, a second lens element 1020, a third lens element 1030, afourth lens element 1040, an aperture stop 1000, a fifth lens element1050, a sixth lens element 1060, an IR-cut filter 1070, a cover-glass1075 and an image surface 1080, wherein the imaging optical lensassembly has a total of six lens elements (1010-1060), and the fifthlens element 1050 and the sixth lens element 1060 are cemented together.

The first lens element 1010 with negative refractive power has anobject-side surface 1011 being convex in a paraxial region thereof andan image-side surface 1012 being concave in a paraxial region thereof.The first lens element 1010 is made of glass material and has theobject-side surface 1011 and the image-side surface 1012 being bothspherical.

The second lens element 1020 with negative refractive power has anobject-side surface 1021 being concave in a paraxial region thereof andan image-side surface 1022 being concave in a paraxial region thereof.The second lens element 1020 is made of plastic material and has theobject-side surface 1021 and the image-side surface 1022 being bothaspheric. Each of the object-side surface 1021 and the image-sidesurface 1022 of the second lens element 1020 has at least one inflectionpoint.

The third lens element 1030 with negative refractive power has anobject-side surface 1031 being concave in a paraxial region thereof andan image-side surface 1032 being concave in a paraxial region thereof.The third lens element 1030 is made of plastic material and has theobject-side surface 1031 and the image-side surface 1032 being bothaspheric. The image-side surface 1032 of the third lens element 1030 hasat least one inflection point.

The fourth lens element 1040 with positive refractive power has anobject-side surface 1041 being convex in a paraxial region thereof andan image-side surface 1042 being convex in a paraxial region thereof.The fourth lens element 1040 is made of plastic material and has theobject-side surface 1041 and the image-side surface 1042 being bothaspheric.

The fifth lens element 1050 with negative refractive power has anobject-side surface 1051 being convex in a paraxial region thereof andan image-side surface 1052 being concave in a paraxial region thereof.The fifth lens element 1050 is made of plastic material and has theobject-side surface 1051 and the image-side surface 1052 being bothaspheric.

The sixth lens element 1060 with positive refractive power has anobject-side surface 1061 being convex in a paraxial region thereof andan image-side surface 1062 being convex in a paraxial region thereof.The sixth lens element 1060 is made of plastic material and has theobject-side surface 1061 and the image-side surface 1062 being bothaspheric.

The IR-cut filter 1070 and the cover-glass 1075 both are made of glassmaterial and located between the sixth lens element 1060 and the imagesurface 1080, and will not affect the focal length of the imagingoptical lens assembly. The image sensor 1090 is disposed on or near theimage surface 1080 of the imaging optical lens assembly.

The detailed optical data of the 10th embodiment are shown in Table 19and the aspheric surface data are shown in Table 20 below.

TABLE 19 10th Embodiment f = 1.21 mm, Fno = 4.00, HFOV = 80.5 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 14.604 1.099 Glass 1.589 61.3 −7.55 2 3.313 1.767 3 Lens 2 −11.257 (ASP) 0.652 Plastic 1.535 55.8 −3.06 41.956 (ASP) 1.176 5 Lens 3 −3.914 (ASP) 0.925 Plastic 1.544 55.9 −5.61 614.990 (ASP) 0.169 7 Lens 4 2.396 (ASP) 2.724 Plastic 1.583 30.2 2.92 8−3.434 (ASP) 0.621 9 Ape. Stop Plano 0.169 10 Lens 5 42.621 (ASP) 0.614Plastic 1.639 23.5 −3.69 11 2.221 (ASP) 0.118 12 Lens 6 2.206 (ASP)0.985 Plastic 1.544 55.9 2.23 13 −2.280 (ASP) 0.800 14 IR-cut filterPlano 0.300 Glass 1.517 64.2 — 15 Plano 0.200 16 cover-glass Plano 0.400Glass 1.517 64.2 17 Plano 1.740 18 Image Plano — Note: Referencewavelength is 587.6 nm (d-line).

TABLE 20 Aspheric Coefficients Surface # 3 4 5 6 7 k = 1.3397E+01−6.4908E−02 −7.4841E+00 6.6674E+01 −3.7065E−01 A4 = 1.9494E−02−6.0209E−03 −3.3127E−02 −2.0859E−02  −2.9930E−02 A6 = −2.7799E−03 −1.8154E−02 −5.8670E−03 2.7329E−02  2.2354E−02 A8 = 1.7865E−04 7.4434E−03  1.0112E−02 −1.2337E−02  −1.6517E−02 A10 = −1.5037E−07 −1.7976E−03 −2.5819E−03 1.6790E−03  3.6059E−03 Surface # 8 10 11 12 13 k= −1.0813E+01 2.4677E+01 −3.5907E+00 −3.8037E+00 −3.3615E+00 A4 =−3.4241E−02 8.2229E−02  5.6582E−02 −4.1573E−02 −2.0479E−03 A6 = 7.4090E−02 −4.6138E−01  −4.5369E−01  9.4001E−02 −2.1692E−01 A8 =−8.5258E−02 1.8898E+00  1.5178E+00 −3.9338E−02  5.3506E−01 A10 = 2.7133E−02 −6.4422E+00  −3.0199E+00 −3.5116E−02 −4.8031E−01 A12 = — — 2.5066E+00  2.6288E−02  1.4361E−01

In the 10th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 10th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 19 and Table 20as the following values and satisfy the following conditions:

10th Embodiment f [mm] 1.21 (R11 − R12)/(R11 + R12) −60.29 Fno 4.00(R9 + R12)/(R9 − R12) 0.90 HFOV [deg.] 80.5 T12/f 1.46 |1/tan(HFOV)|0.17 TL/f 11.91 T23/CT2 1.80 f1/f3 1.34 CT6/CT5 1.60 Σ|f/fi| 2.06|R11/EPD| 7.27 Td/ImgH 6.42 |R7/R8| 0.70 |Y62/Y11| 0.23 (R5 + R6)/(R5 −R6) −0.59 — —

The foregoing description, for the purpose of explanation, has beendescribed with reference to specific embodiments. It is to be noted thatTABLES 1-20 show different data of the different embodiments; however,the data of the different embodiments are obtained from experiments. Theembodiments were chosen and described in order to best explain theprinciples of the disclosure and its practical applications, to therebyenable others skilled in the art to best utilize the disclosure andvarious embodiments with various modifications as are suited to theparticular use contemplated. The embodiments depicted above and theappended drawings are exemplary and are not intended to be exhaustive orto limit the scope of the present disclosure to the precise formsdisclosed. Many modifications and variations are possible in view of theabove teachings.

What is claimed is:
 1. An imaging optical lens assembly comprising sixlens elements, the six lens elements being, in order from an object sideto an image side, a first lens element, a second lens element, a thirdlens element, a fourth lens element, a fifth lens element and a sixthlens element; wherein the first lens element has negative refractivepower, the second lens element has negative refractive power, the thirdlens element has negative refractive power, the third lens element hasan object-side surface being concave in a paraxial region thereof, andthe imaging optical lens assembly has a total of six lens elements;wherein a focal length of the imaging optical lens assembly is f, afocal length of the first lens element is f1, a focal length of thesecond lens element is f2, a focal length of the third lens element isf3, a focal length of the fourth lens element is f4, a focal length ofthe fifth lens element is f5, a focal length of the sixth lens elementis f6, a focal length of the i-th lens element is fi, a sum of absolutevalues of ratios f/fi is Σ|f/fi|, a curvature radius of the object-sidesurface of the third lens element is R5, a curvature radius of animage-side surface of the third lens element is R6, and the followingconditions are satisfied:2.47<Σ|f/fi|<5.0, wherein i=1,2,3,4,5,6; and−4.0<(R5+R6)/(R5−R6)<0.65.
 2. The imaging optical lens assembly of claim1, wherein the image-side surface of the third lens element is concavein a paraxial region thereof.
 3. The imaging optical lens assembly ofclaim 1, wherein a curvature radius of an object-side surface of thesixth lens element is R11, an entrance pupil diameter of the imagingoptical lens assembly is EPD, and the following condition is satisfied:|R11/EPD|<1.50.
 4. The imaging optical lens assembly of claim 1, whereinan axial distance between an object-side surface of the first lenselement and an image-side surface of the sixth lens element is Td, amaximum image height of the imaging optical lens assembly is ImgH, andthe following condition is satisfied:4.0<Td/ImgH≤5.64.
 5. The imaging optical lens assembly of claim 1,wherein a maximum effective radius of an object-side surface of thefirst lens element is Y11, a maximum effective radius of an image-sidesurface of the sixth lens element is Y62, half of a maximal field ofview of the imaging optical lens assembly is HFOV, and the followingconditions are satisfied:|Y62/Y11|<0.48; and|1/tan(HFOV)|<0.50.
 6. An imaging optical lens assembly comprising sixlens elements, the six lens elements being, in order from an object sideto an image side, a first lens element, a second lens element, a thirdlens element, a fourth lens element, a fifth lens element and a sixthlens element; wherein the first lens element has negative refractivepower, the second lens element has negative refractive power, the thirdlens element has negative refractive power, the third lens element hasan object-side surface being concave in a paraxial region thereof, andthe imaging optical lens assembly has a total of six lens elements;wherein at least one of an object-side surface of the second lenselement, an image-side surface of the second lens element, theobject-side surface of the third lens element and an image-side surfaceof the third lens element has at least one inflection point, a focallength of the imaging optical lens assembly is f, a focal length of thefirst lens element is f1, a focal length of the second lens element isf2, a focal length of the third lens element is f3, a focal length ofthe fourth lens element is f4, a focal length of the fifth lens elementis f5, a focal length of the sixth lens element is f6, a focal length ofthe i-th lens element is fi, a sum of absolute values of ratios f/fi isΣ|f/fi|, a curvature radius of the object-side surface of the third lenselement is R5, a curvature radius of the image-side surface of the thirdlens element is R6, and the following conditions are satisfied:2.0<Σ|f/fi|<5.0, wherein i=1, 2, 3, 4, 5, 6; and−4.0<(R5+R6)/(R5−R6)<0.65.
 7. The imaging optical lens assembly of claim6, wherein the fifth lens element has negative refractive power, and thesixth lens element has positive refractive power.
 8. The imaging opticallens assembly of claim 6, wherein the image-side surface of the thirdlens element is concave in a paraxial region thereof, and at least threeof the six lens elements of the imaging optical lens assembly are madeof plastic material.
 9. The imaging optical lens assembly of claim 6,wherein a curvature radius of an object-side surface of the sixth lenselement is R11, an entrance pupil diameter of the imaging optical lensassembly is EPD, the focal length of the first lens element is f1, thefocal length of the third lens element is f3, and the followingconditions are satisfied:|R11/EPD|1.50; and1.25<f1/f3<5.0.
 10. The imaging optical lens assembly of claim 6,wherein an axial distance between an object-side surface of the firstlens element and an image-side surface of the sixth lens element is Td,a maximum image height of the imaging optical lens assembly is ImgH, andthe following condition is satisfied:4.0<Td/ImgH≤5.64.
 11. The imaging optical lens assembly of claim 6,wherein a curvature radius of an object-side surface of the fourth lenselement is R7, a curvature radius of an image-side surface of the fourthlens element is R8, a curvature radius of an object-side surface of thefifth lens element is R9, a curvature radius of an image-side surface ofthe sixth lens element is R12, and the following conditions aresatisfied:|R7/R8|<1.10; and−1.0<(R9+R12)/(R9−R12)<1.0.
 12. The imaging optical lens assembly ofclaim 6, wherein an axial distance between the first lens element andthe second lens element is T12, the focal length of the imaging opticallens assembly is f, and the following condition is satisfied:0.80<T12/f<2.0.
 13. The imaging optical lens assembly of claim 6,wherein an image-side surface of the fifth lens element and anobject-side surface of the sixth lens element are both aspheric, thefifth lens element and the sixth lens element are cemented together. 14.An image capturing unit, comprising: the imaging optical lens assemblyof claim 6; and an image sensor, wherein the image sensor is disposed onan image surface of the imaging optical lens assembly.
 15. An electronicdevice, comprising: the image capturing unit of claim
 14. 16. An imagingoptical lens assembly comprising six lens elements, the six lenselements being, in order from an object side to an image side, a firstlens element, a second lens element, a third lens element, a fourth lenselement, a fifth lens element and a sixth lens element; wherein thefirst lens element has negative refractive power, the second lenselement has negative refractive power, the third lens element hasnegative refractive power, and the imaging optical lens assembly has atotal of six lens elements; wherein a focal length of the imagingoptical lens assembly is f, a focal length of the first lens element isf1, a focal length of the second lens element is f2, a focal length ofthe third lens element is f3, a focal length of the fourth lens elementis f4, a focal length of the fifth lens element is f5, a focal length ofthe sixth lens element is f6, a focal length of the i-th lens element isfi, a sum of absolute values of ratios f/fi is Σ|f/fi|, a curvatureradius of an object-side surface of the third lens element is R5, acurvature radius of an image-side surface of the third lens element isR6, a curvature radius of an object-side surface of the sixth lenselement is R11, an entrance pupil diameter of the imaging optical lensassembly is EPD, an axial distance between an object-side surface of thefirst lens element and an image-side surface of the sixth lens elementis Td, a maximum image height of the imaging optical lens assembly isImgH, and the following conditions are satisfied:2.0<Σ|f/fi|<5.0, wherein i=1, 2, 3, 4, 5, 6;−4.50<(R5+R6)/(R5−R6)<2.80;|R11/EPD|<1.50; and1.0<Td/ImgH≤5.64.
 17. The imaging optical lens assembly of claim 16,wherein the focal length of the first lens element is f1, the focallength of the third lens element is f3, and the following condition issatisfied:1.25<f1/f3<5.0.
 18. The imaging optical lens assembly of claim 16,wherein a curvature radius of an object-side surface of the fourth lenselement is R7, a curvature radius of an image-side surface of the fourthlens element is R8, and the following condition is satisfied:|R7/R8|<1.10.
 19. The imaging optical lens assembly of claim 16, whereinat least one of an object-side surface of the second lens element, animage-side surface of the second lens element, the object-side surfaceof the third lens element and the image-side surface of the third lenselement has at least one inflection point.
 20. The imaging optical lensassembly of claim 16, wherein an image-side surface of the fifth lenselement and the object-side surface of the sixth lens element are bothaspheric, the fifth lens element and the sixth lens element are cementedtogether, half of a maximal field of view of the imaging optical lensassembly is HFOV, and the following condition is satisfied:|1/tan(HFOV)|<0.50.
 21. An imaging optical lens assembly comprising sixlens elements, the six lens elements being, in order from an object sideto an image side, a first lens element, a second lens element, a thirdlens element, a fourth lens element, a fifth lens element and a sixthlens element; wherein the first lens element has negative refractivepower, the second lens element has negative refractive power, the thirdlens element has negative refractive power, the third lens element hasan object-side surface being concave in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof, and theimaging optical lens assembly has a total of six lens elements; whereinan axial distance between the first lens element and the second lenselement is T12, a focal length of the imaging optical lens assembly isf, and the following condition is satisfied:0.80<T12/f<2.0.
 22. The imaging optical lens assembly of claim 21,wherein the second lens element has an object-side surface being convexin a paraxial region thereof, a curvature radius of an object-sidesurface of the sixth lens element is R11, an entrance pupil diameter ofthe imaging optical lens assembly is EPD, and the following condition issatisfied:|R11/EPD|<1.50.
 23. The imaging optical lens assembly of claim 21,wherein the focal length of the imaging optical lens assembly is f, afocal length of the first lens element is f1, a focal length of thesecond lens element is f2, a focal length of the third lens element isf3, a focal length of the fourth lens element is f4, a focal length ofthe fifth lens element is f5, a focal length of the sixth lens elementis f6, a focal length of the i-th lens element is fi, a sum of absolutevalues of ratios f/fi is Σ|f/fi|, and the following condition issatisfied:2.0<Σ|f/fi|<5.0, wherein i=1, 2, 3, 4, 5,
 6. 24. The imaging opticallens assembly of claim 21, wherein a focal length of the first lenselement is f1, a focal length of the third lens element is f3, and thefollowing condition is satisfied:1.25<f1/f3<5.0.
 25. The imaging optical lens assembly of claim 21,wherein a curvature radius of an object-side surface of the fourth lenselement is R7, a curvature radius of an image-side surface of the fourthlens element is R8, and the following condition is satisfied:|R7/R8|<1.10.
 26. The imaging optical lens assembly of claim 21, whereinan axial distance between an object-side surface of the first lenselement and an image-side surface of the sixth lens element is Td, amaximum image height of the imaging optical lens assembly is ImgH, andthe following condition is satisfied:1.0<Td/ImgH≤5.64.
 27. An image capturing unit, comprising: the imagingoptical lens assembly of claim 21; and an image sensor, wherein theimage sensor is disposed on an image surface of the imaging optical lensassembly.
 28. An electronic device, comprising: the image capturing unitof claim 27.